As you are anytime due for your withdrawal bleeding now, your chances of pregnancy
are almost none. You can wait for your period and if at all you miss it ( which is very unlikely), you can get a pregnancy test with a fresh early morning sample of urine. If you are pregnant, you will miss the period. Pre-ejaculate
contains enough sperms to cause pregnancy if it is the fertile period. Consult your doctor if needed for further advice. Good luck.